PHP BCMath Black Book: The secret to mastering high-precision mathematical calculations

PHP BCMath Black Book is an important guide focusing on high-precision mathematical calculations. This book covers the basic concepts and practical skills of the BCMath extension library, helping developers master the secrets of high-precision calculations in PHP. Through in-depth explanations and example demonstrations, readers will learn how to perform accurate and efficient mathematical operations in PHP to improve the accuracy and performance of the program. Whether you are a beginner or an experienced developer, you can learn practical skills and knowledge from this book to bring more possibilities to your projects.

BCMath extension is a PHP built-in extension that provides high-precision mathematical computing capabilities, supports up to 16 digits of precision after the decimal point, and meets the needs of various complex mathematical operations.

2. BCMath function

BCMath provides a rich and practical function library, covering basic mathematical operations, carry conversion, trigonometric functions, exponential functions, logarithmic functions, etc.

3. Installation and configuration

BCMath is a standard extension of php and does not need to be installed separately, but it needs to be enabled in php.ini. You can activate the BCMath extension by modifying the extension=bcmath option in php.ini and restarting the PHP service.

4. Usage examples

// 加法
$result = bcadd("1.23", "4.56"); // 输出："5.79"

// 减法
$result = bcsub("10.00", "5.50"); // 输出："4.50"

// 乘法
$result = bcmul("2.00", "3.50"); // 输出："7.00"

// 除法
$result = bcdiv("10.00", "3.00"); // 输出："3.333333333333333"

// 取模
$result = bcmod("10", "3"); // 输出："1"

// 平方根
$result = bcsqrt("16"); // 输出："4"

// 幂运算
$result = bcpow("2", "3"); // 输出："8"

// 指数/对数
$result = bclog("100"); // 输出："4.605170185988092"
$result = bcpow(2, bclog("100")); // 输出："100"

5. High-precision mathematical calculation examples

Calculate the value of π:

$pi = "3";
$k = 0;

while ($k < 1000) {
$pi = bcadd($pi, bcdiv(bcmul("2", bcpow("2", $k)), bcpow("10", $k)));
$k++;
}

echo $pi; // 输出："3.141592653589793"

Calculate Fibonacci Sequence:

function fibonacci($n) {
if ($n <= 1) {
return $n;
} else {
return bcadd(fibonacci($n - 1), fibonacci($n - 2));
}
}

for ($i = 0; $i < 10; $i++) {
echo fibonacci($i) . PHP_EOL;
}

Output:

$result = bcdiv("10", "3"); // 输出："3.333333333333333"

Conclusion:

The BCMath extension provides PHP with high-precision mathematical computing capabilities to meet various complex scientific computing needs. By mastering the BCMath function and how to use it, you can easily master number processing problems and become a number calculation master.

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